Make NAND_BBT_NO_OOB_BBM configurable or let the gpmi driver decide?

[Miquel Raynal]

Hi Daniel,

dg at emlix.com wrote on Wed, 23 Feb 2022 11:59:02 +0100:

> Am 22.02.22 um 23:02 schrieb Han Xu:
> > On 22/02/21 08:00PM, Daniel Glöckner wrote:  
> >> we are using UBI on a NAND flash with BBT and have recently observed
> >> bad blocks where nand_markbad_bbm returns an error. Since that error is
> >> returned by nand_block_markbad_lowlevel even when marking the block in
> >> the BBT succeeds, UBI goes into read-only mode. We would therefore like
> >> to set NAND_BBT_NO_OOB_BBM.  
> > 
> > Could you please describe more details about what kind of error, how to
> > reproduce it and on which kernel version?  
> 
> You need a flash that has one bad block where programming the BBM sets
> NAND_STATUS_FAIL in its status register. The latest kernels should still
> have problems when this happens in a UBI.

I believe we should try to tackle "why" this happens more than try to
workaround its consequences. Can you give more details about why we get
this status?


Thanks,
Miquèl